Meteorological Observations. 



Abstract of the Results of the Hourly Meteorological Observations 

 at the Surveyor General's Office, Calcutta, 

 in the month of April 1869. 

 Monthly Results. 



Inches, 



Mean height of the Barometer for the month... ... ... 29.756 



Max. height of the Barometer occurred, at 9 a. m. on the 1st. ... 22.968 



Min. height of the Barometer occurred at 5 p.m. on the 16th. ... 29.530 



Extreme range of the Barometer during the month ... ... 0.438 



Mean of the daily Max. Pressures ... ... ... ... 29.834 



Ditto ditto Min. ditto ... ... ... ... 29.680 



Mean daily range of the Barometer during the month ... ... 0.154 



Mean Dry Bulb Thermometer for the month 

 Max. Temperature occurred at 3 & 4 p. m. on the 6th. 

 Min. Temperature occurred at 3 a. m. on the 16th 

 Extreme range of the Temperature during the month 

 Mean of the daily Max. Temperature ... 



Ditto ditto Min. ditto, 

 Mean daily range of the Temperature during the month. 



86.5 

 99.5 

 75.0 

 24.5 

 95.2 

 79.6 

 16.6 



Mean Wet Bulb Thermometer for the month ... ... ... 78.5 



Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer 8.0 



Computed Mean Dew-point for the month ... ... ... 73.7 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 12.8 



Mean Elastic force of Vapour for the month 



Inches. 

 . 0.819 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 8.73 



Additional Weight of Vapour required for complete saturation ... 4.37 

 Mean degree of humidity for the month, complete saturation being unity 0.67 



Mean Max. Solar radiation Thermometer for the month. 



131. 



Inches. 



Rained 7 days, — Max. fall of rain during 24 hours ... ... 0.12 



Total amount of rain during the month ... ... ... 0.20 



Total amount of rain indicated by the Gauge attached to the anemo- 

 meter during the month ... ... ... ... ... 0.11 



Prevailing direction of the Wind S. S. W., & S. W. 



